Remove uberJar parameter from Maven mojos/goals in 1.13

[famod]

Description
As agreed on the mailing list, the uberJar parameter in QuarkusBootstrapMojo (BuildMojo and GenerateCodeMojo respectively) should not be used anymore.
Instead, quarkus.package.type=uber-jar shall be used, as already documented: https://quarkus.io/guides/maven-tooling#uber-jar-maven

Implementation ideas

• log a warning in the mojos (Deprecate uberJar mojo parameter and log a warning when used #14886)
• remove remaining usages (Deprecate uberJar mojo parameter and log a warning when used #14886)
• remove usages in quickstarts, if any (none)
• @glefloch: deprecate and log a warning in the gradle plugins (Deprecate --uber-jar option in quarkusBuild task #14899)
• remove the parameter in 1.13 (Remove uberJar Maven/Gradle param & quarkus.package.uber-jar property #14987)

[ghost]

/cc @quarkusio/devtools

[glefloch]

@famod we can also set this param in gradle plugin such as gradle quarkusBuild -PuberJar. I guess this should also be removed no? I can handle the gradle part.

[famod]

@glefloch I think this makes sense! We first need to deprecate it and log a warning to give users time until it is removed in 1.13.
If all goes to plan I'll create a PR later today for the Maven part. So if you would cover the Gradle part that would be great! Thanks!

[famod]

/cc @gsmet @aloubyansky @stuartwdouglas FYI ^ (Gradle part wasn't discussed before)

[famod]

@glefloch FYI, #14886 deprecates the mojo parameter and logs a warning.